<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ConditionalParser.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.expr;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.parse.ParseContext;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.jsimpledb.parse.ParseException;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.jsimpledb.parse.ParseSession;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.parse.Parser;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.parse.SpaceParser;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>/**<a name="line.16"></a>
<span class="sourceLineNo">017</span> * Parses conditional expressions of the form {@code x ? y : z}.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span>public class ConditionalParser implements Parser&lt;Node&gt; {<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>    public static final ConditionalParser INSTANCE = new ConditionalParser();<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    private final SpaceParser spaceParser = new SpaceParser();<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    @Override<a name="line.25"></a>
<span class="sourceLineNo">026</span>    public Node parse(ParseSession session, ParseContext ctx, boolean complete) {<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>        // Parse test<a name="line.28"></a>
<span class="sourceLineNo">029</span>        final Node test = LogicalOrParser.INSTANCE.parse(session, ctx, complete);<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>        // Parse '?'<a name="line.31"></a>
<span class="sourceLineNo">032</span>        this.spaceParser.parse(ctx, complete);<a name="line.32"></a>
<span class="sourceLineNo">033</span>        if (!ctx.tryLiteral("?"))<a name="line.33"></a>
<span class="sourceLineNo">034</span>            return test;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>        // Parse true result<a name="line.36"></a>
<span class="sourceLineNo">037</span>        this.spaceParser.parse(ctx, complete);<a name="line.37"></a>
<span class="sourceLineNo">038</span>        final Node ifTrue = LogicalOrParser.INSTANCE.parse(session, ctx, complete);<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>        // Parse ':'<a name="line.40"></a>
<span class="sourceLineNo">041</span>        this.spaceParser.parse(ctx, complete);<a name="line.41"></a>
<span class="sourceLineNo">042</span>        if (!ctx.tryLiteral(":"))<a name="line.42"></a>
<span class="sourceLineNo">043</span>            throw new ParseException(ctx).addCompletion(": ");<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>        // Parse false result<a name="line.45"></a>
<span class="sourceLineNo">046</span>        this.spaceParser.parse(ctx, complete);<a name="line.46"></a>
<span class="sourceLineNo">047</span>        final Node ifFalse = LogicalOrParser.INSTANCE.parse(session, ctx, complete);<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>        // Return node<a name="line.49"></a>
<span class="sourceLineNo">050</span>        return new Node() {<a name="line.50"></a>
<span class="sourceLineNo">051</span>            @Override<a name="line.51"></a>
<span class="sourceLineNo">052</span>            public Value evaluate(ParseSession session) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>                return test.evaluate(session).checkBoolean(session, "conditional") ?<a name="line.53"></a>
<span class="sourceLineNo">054</span>                  ifTrue.evaluate(session) : ifFalse.evaluate(session);<a name="line.54"></a>
<span class="sourceLineNo">055</span>            }<a name="line.55"></a>
<span class="sourceLineNo">056</span>        };<a name="line.56"></a>
<span class="sourceLineNo">057</span>    }<a name="line.57"></a>
<span class="sourceLineNo">058</span>}<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>




























































</pre>
</div>
</body>
</html>
